The Baryon acoustic oscillations (BAO) are fluctuations in the photon-baryonic plasma that froze at recombination at the so called drag sound horizon. Because the sound horizon can be calculated rather simply from basic assumptions of the pre-recombination plasma, they provide a standard ruler which can be seen in the clustering of large scale structures. This provides an independent way to probe cosmological parameters, complimentary to this of the Supernova and the CMB surveys, see ([1]}, [2]}, [3]}). The BAO peak can be measured from objects with different nature and using different methods. For example: the BOSS experiment measures the clustering of different galaxies: emission-line galaxies (ELGs), luminous red galaxies (LRGs), and quasars, and also from the correlation function of the Lyman-alpha (Ly\(\alpha \) ) absorption lines in the spectra of distant quasars etc. The peak can be seen on different redshifts, providing us with a standard ruler evolving with the Universe since the recombination epoch ([4]}, [5]}).
